Real-time judgment method for improvement state of muck on horizontal conveyor belt of shield tunneling machine

Abstract

The invention discloses a real-time judgment method for the improvement state of muck on a horizontal conveyor belt of a shield tunneling machine, which comprises the following steps: by taking field muck and an improver as experimental materials, carrying out slump test and accumulation test on different improved muck to obtain a value range of a static state secant angle of the muck in a proper improvement state; the method comprises the steps that muck on a horizontal conveying belt of a shield tunneling machine on site is scanned through a three-dimensional laser scanner, point cloud data of the surface of the muck is obtained, a muck surface curve on the horizontal conveying belt of the shield tunneling machine is established, and the secant angle of the muck on the horizontal conveying belt of the shield tunneling machine is determined; and judging the improvement state of the muck on the horizontal conveyor belt of the shield tunneling machine in real time according to the value range of the secant angle theta of the muck on the horizontal conveyor belt of the shield tunneling machine and the static state secant angle of the muck under the appropriate improvement state. According to the method, the consumption of manpower and financial resources caused by muck slump measurement in the shield tunneling process can be reduced, and the hysteresis quality of muck improvement state judgment is avoided.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction, in particular to a method for real-time judging of the improved state of dregs on a horizontal conveyor belt of a shield machine based on a three-dimensional laser scanning technology. Background technique [0002] During the construction of the shield tunnel, the shield muck can reach a suitable improved state, which is an important guarantee for the safe and efficient tunneling of the shield. Improper improvement of dregs may cause the following hazards: when the improved dregs are too thin and fluid, it is easy to cause gushing of the screw conveyor, which will lead to a sudden change in the pressure of the soil bin and cannot support the pressure on the face of the tunnel, resulting in a large settlement. In severe cases, it will lead to landslides in front of the shield; when the fluidity of the improved muck is poor, it is not conducive to the removal of muck, and the dre...

AI Technical Summary

Problems solved by technology

Improper improvement of dregs may cause the following hazards: when the improved dregs are too thin and fluid, it is easy to cause gushing of the screw conveyor, which will lead to a sudden change in the pressure of the soil bin and cannot support the pressure on the face of the tunnel, resulting in a large settlement. Severe cases will lead to landslides in front of the shield; when the fluidity of the improved muck is poor, it is not conducive to the removal of muck, and the dregs with strong adhesion are easy to stick to the cutter head and increase the wear of the cutter head

[0003] At present, the indoor slump test is mainly used to judge the improvement status of the muck on the conveyor belt, and the improvement status can be judged by measuring the slump value. This method requires relevant personnel to remove the muck on the conveyor belt of the shield machine for slump There is a certain hysteresis in judging the muck on the conveyor belt

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